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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad9d7f2692cf62b1005f0632b243c84ed5aaf3c2a779bfd71b07e2c98e13954' 
  AND token = 'hOk1Uth25zr3J5RUVt7TXmuqJaWy/5SrtETDdZzbpdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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