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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d46671217ca5e189380276ef9cc1b18df64f2839db18b4a92e711731061209a' 
  AND token = '9Wq5U5RL15YDc9vrgGGW2lvA9hO5tG+WdAdW6bFyWq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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