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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '381ccd9bbb6d07a0fe07124dee12b491536cce9017bb351e139d00cba896c7fc' 
  AND token = '44o7hLcXFKVVzPbox7GyQS1KlNuiX1ALFSNb4sdY5dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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