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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6df165a07a5254f408487a0c14da679978ef31d53db81dd434ff8ee6409c79e2' 
  AND token = '/q59QWoVU3DdpV5U8zsBpSCiDRUCWgjAKyGRVEr24OE=' 
  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"
    }
  }
}