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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65c8dc4f795334208dbe8010937733e8763cec1db0d152ef30a0bd4e6dec9ae4' 
  AND token = 'Cnv3H22p/1CdmtUWQOHA0VYtDbnDXww/XBy+9JQa6Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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