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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eafff5622f29bf2c8bddb5ca49504ab0ed5c07a4851b71d08e4417c1c38ff09' 
  AND token = 'Qee3C3n1Dg0uC6srr6rzD4pQGHuzSM67lIjeKANX3cI=' 
  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"
    }
  }
}