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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '897c79105c4999064c001a5269318f843c134e61fe91fd1ff4224dbaa1b0da63' 
  AND token = '8LXhgrJ/9T0K3Y/0AMWf5nbCk6pdMX6TLxCeYmWKlCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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