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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dccf8039509f106eeb97146ad19812b897e2f751f5e885d3475c9241a0f5664' 
  AND token = 'Ay0z3a8lWg1WcFsTzyWeNjH3M/gm+M0xQGBzd63rqds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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