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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa214b600b932ca27b1ac05340c14d248a5f13ca8f532cd77ccee30d02ef49ae' 
  AND token = '7Mudi2ml5WaXOU8vYmTfdOUeppA73ix8rx5b0udTcSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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