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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5747d158022526b003f48c144a62211aa2372fa2b016abe589b6803ffa058cd' 
  AND token = 'QB91iFsU0WV+u44sGWof6OgdVbFDdz6WdHoXFk8/UHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00143

JSON explain

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