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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a7d47cc42392a61d6ae99baef2347d6e1e46b0b7bce261d847fc380bc88361' 
  AND token = 'j8+fl5rdcsOkx84im0xm3nx0gKqOD6lIbnXDOUXdKI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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