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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1c2ffffbc4acc701ecd9f37a94e34c78d4275f818da7f17d80d09b035efe96' 
  AND token = 'a7475K7LE0kxy2BplTwEfJNT/dX+lFzo0q9pdSsjrBY=' 
  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"
    }
  }
}