SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf38994d191cb6abfa11976482db1304a4f5239b52b0f13e937f3edcee4fe962' 
  AND token = 'FDRvtu+0K5QtmXVZTngsYvJKZ5rNTkFfSlEJ18Yvhvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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