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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf0cff5d511133e21b50bff2a27e3db6059fc7f1815f8ba46ca684578da320bf' 
  AND token = 'BcAtyg24VGA73n2RH/B6Ao2cxKkbDufOkDgPhYga3lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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