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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e33cf40465b3de3f36e2707c86d5d2098539d93ae02cb250a301b76d93d0edeb' 
  AND token = 'HgmCVR0cbWQVZZ9pvsyKiYqk7x9KB5FEl8JsYWIR9T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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