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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c02ca9e3e741ff4c62086d4f3ef56bd77e325e456a4f2670e289b3fdea9219' 
  AND token = 'NyluDRplFtSsPijt2kmMErER98V2FSkaeDF2NB5/E+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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