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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb7db986584b998accd64388866c79d004f2a8446d85fe8fdd6388cfa71f9df' 
  AND token = 'axuO/tE3Hx/vrME4adpvWiMOMIdgViE3ZyKui7NfYio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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