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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4729e94ee96eb1ea8a5381c4082bce456652420de0130ad1734ac5af998c26df' 
  AND token = 'BhnN2V/uB7B20ar8o3rKMyn0cr5OgGsUYwkpTdzVp8I=' 
  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"
    }
  }
}