Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9a301b556ef03c4c1bad9bb0b90f7b495fa6909fae7f71bcc246df7abf8937' 
  AND token = '7gZILc9stdodcuuKznNpRThtPvlse+Jv0/CsQD90Ea0=' 
  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"
    }
  }
}