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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaed96f1432fd434065e1ba17a1031322a06c8035180a5abcada3b009e40d3da' 
  AND token = 'a2UBYslT5WkinIer/PKqPtMU9l4hZvUKgwlgz8fhkog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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