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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '153a96d3de95c91c5c2270a4e49532c204613f7572c21b54f51849ec00e37c8c' 
  AND token = 'afI51hzpE04n++i43c/GoXo2x1FkXJLDr3bE1BB5zoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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