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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0478a670f9620655c6d0b16e57e5d98e15ad5c4d062b7b9bd2ba0c3703875d8b' 
  AND token = 'oS9sWONBNDhb+pkXS0L8mq7nzXkaU2uFh3qkIrNAzfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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