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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c52bf970bd2dd0eb93f3cf3e27e429eb93e48f4abb1b6e93077f81e708e0f62' 
  AND token = 'mSLk7mxGtOb803C9Vi3JlW5X+OPoFFyrxQwsW4fzwnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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