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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd118c5f18031e78da02c34816cbe970c35a2836582bff11f07ec911e1face7fd' 
  AND token = 'FheOC+/xkJXbnGnColOcC0c5E3jqHPC2RqTBrdtQIX4=' 
  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"
    }
  }
}