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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '485044ffed2c0dfa0491da286e2880c8dbedbf492b5df4b58b4cd38ed4bc9ac7' 
  AND token = 'Z1AURukFi39xYDpvPdp/ELeirzyWFCK2aU2bIT5FaOo=' 
  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"
    }
  }
}