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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94114eb3376321a80e69449df09a8ccef66b053d487a2bcb5cc5312f7d15300e' 
  AND token = 'KRBVCb2zR6d+uFwZaqaQG+sxXCxacMqa17iNchcPxDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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