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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcdcaa1b0f42f81e23e193a2c31e0b6339a57a1802a9b93e4c32d2017688d854' 
  AND token = 'RMybywtRcPOawsE4yxnmyD6Kj6Xdo4aBN4dU1wHE/n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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