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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '786728a35f05095b9e0638bd2e0b826d4eb2b66fcb6838cd548b4484bef488c8' 
  AND token = 'Snt8w9dnMEjiWo7iMksixFHpxfw77/x6O6U9dngBfGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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