Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b87c9b58331ecd71c6e96d3e7285e12142ed0eeeee87cfbb67110b3f9db303' 
  AND token = 'RLidx1l/8m62pjisQKmPtf5ljomMQevq1p1Inh4+Qeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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