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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e6f905cd38a6ca7e5d8fd8a0a4bc007537ccec9c645e56766c4e37656c86dc' 
  AND token = '8myF7Qb8+NShwWEz6rrbx6ajV50X2B2lLwtlvLja4p8=' 
  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"
    }
  }
}