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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4448f1f1811fd57f8b6dae42e1a75f832767a3741acf27d1e830f430c7a8fb16' 
  AND token = 'flbqnt/zJ7ikCAndBQsgvziX+bh0O3JmrirDk4rCIck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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