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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd845ab181d826654d67dbc6ed7e6f7b3cb57f8c6892b9f74c89efa171887b0' 
  AND token = 'Qn+yZMY5tRWNxLmY65Qug71XtfIkmimYy8405Eunkk0=' 
  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"
    }
  }
}