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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabda958ce8ad6146cc5df9828ed76b2990719cb444b78e193dbeefae1e183a4' 
  AND token = 'YnJwV5bWp1+3zWVNBSk1WLLcU6K8/GGiE4CFw1M6RJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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