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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28bd0f26d3005a330fd59dcb4945e27a707f0ee7c5c7434f65578359a611eff3' 
  AND token = 'H1YbeHeV96zVehnIQK1J6TOxfRKQNIa2S594gSM3Msg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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