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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa1486e40250b1f1ce5e740713d0c7a52408f52c70b97c265f1cbe2dd5b9caa' 
  AND token = 'd0cpT0x1EJnyvn+mkMULmA6mo3kSXXRGrU3CfMauzqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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