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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8b7c84ab9a521637e6cb96d5bb624351a00cbc6b377048e3bdd751a5d3eb4fd' 
  AND token = 'I9BGvu4Ao4qH7DwcPnprUnTtUi3/Loymr+pfn5IbwjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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