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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1317a9b6fa44fd62baf0ea373e0cd2cad0ebf23f294d78828e96202faa905a69' 
  AND token = 'GNt1t0a5jQ0s83fX2zlGOv+ZYzOeJYLzk9wDpkYymMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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