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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba744e1d4a2d20a2cd8ef1d75cf7a748a8113f5d7aef5f10a46326656d9d008' 
  AND token = 'p3y4d5q8Mo4R8CcIw6COiElmymc1hTFQs+hYe7DnDZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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