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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '422c37a5e064526c68f90e9cd4c3bf433c93f45a165d656995040e724f4842c8' 
  AND token = 'IQ7hBtXXwGRN3uDpYRoEB76rlXKKb83QiYnkkwkIa2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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