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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd6637e9cebb43adefcc8d38994c5dd65236b92b14dfc4b3373cb9186aa863d8' 
  AND token = 'UWV5CXMU6D1/+kTmrW+Dre/wzQRCcEaLs+rG5Ws5Rk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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