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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba7104b982022988ee829494e218ad22f46cac00be6de0a3fc9515cd8ea7394' 
  AND token = 'cPviBTiIEf0egUTxRRMBpKjiwrAyH+nKd1csG+z2gEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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