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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a52f605c46e442ad9d3276ea20aeef88695c200956d8d92ef87573ac605a073f' 
  AND token = 'lkf3EDkN005dSya9TRdGRjBZhPiLG4/7OmMCB1/+2FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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