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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '508a562d6cbecf25d1ccacad2bdeeefa4aee8be98df05beb7c0abce7d32da95a' 
  AND token = 'dD+lr/vi0b2Vv5gpXfu7UhGFB5uBoBSkzm7kgG/rBq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}