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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '021a668250419c725863d6210148adf96f98b8ce60398ee60ce40695b76f06da' 
  AND token = 'lFS7g187SlhHxrp4x/Ms9rsyFLJRNwut0/SfAaTDLkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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