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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0994ab3c1e5610df8089c834ec2f8199d85498399e76ee1096e313d44987a55e' 
  AND token = '4dFI12e1/Klcp5A9DZUY0MYcqkrzhBscAkEpWUOtloY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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