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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a83a84caf0019e3b7d5b7144e819f30a3b48870c1f0a4be2205824438c7be7a' 
  AND token = 'jLhpdX8MUKGvuMQXXJAu8fGMp0hDyXqqIlT385/VB6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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