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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c756288dc77cb580f19831d36a3a44e6c1b7ac48d369b28d655c1ef9218a4de8' 
  AND token = 'NnMAEC56u5HfDySmYUiOGv8Ub90gm6q46I1Pcrog+VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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