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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a40b859ab29ef2dc4bad45050ad5c6d4785e730804e54177641bc7f7878538' 
  AND token = 'qGEDv7iZTsDy3sUYVmNZC72KKJbqCJiD64LXGh8ilWI=' 
  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"
    }
  }
}