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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f29228b436dbb00bf95e95b7a9b9407794d044a3751c5a497aaa2a2e723846' 
  AND token = 'KBO7iWRkG+ouClqSUdCl53DmWBhQQkrFGYK4Jm+6S00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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