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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc831d629aa6381906a83210f886aa6304c03b7c4eb67f46b257fd72c30a11ec' 
  AND token = 'jzp+jERlH7y0UYDElcecAQup5EViiQPbWK0MZ9kbEkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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