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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86797187bae5174cc8ed1f64fca42048f274e34140e797e27c693a571b7dd9f' 
  AND token = 'IHAd42uMRjrxjpF79plAOe7fO2LI35s28HSglJ9T+j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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