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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a729c7341763c2dc39e43e7def52edeb0a2ca90b4be7998b6bf980d87710585a' 
  AND token = 'G8E0Nsg87tqaK7GY7USeVuhcmE6+QtMISKt3d/boSQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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