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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '046c78e0559a79f6472ec65249bc4c3cfaa946c5f20cb1c35eaf359e1c6db793' 
  AND token = 'XC5ZFcy6ZTHc1gS13RKvmVLWWSOXhyDmmxROc39JOn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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