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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb857388eab28e57eb6d57170f095ec5e8476da17ee2b10ebb8a085e7046a137' 
  AND token = 'r7n6XGHrGimKoIecMsini3e+0ZzNVdF0T6+jSCcx1hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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