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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d51b9d650985fad3cd6a81a9d2b4259ece7b25016338b98798356112bc843cb' 
  AND token = 'Ou0aSd9W9pl8CxH+F0P/1o/+b2ZTT0+MTGcVXF9PTxw=' 
  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"
    }
  }
}