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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e8bf0f293f3724911c2e326b0c45816f45e166305c0d9412a46d00021ec342d' 
  AND token = 'Eif09zkQtEIU92m3XG4VclPB2Id/TqVi1y4pDYSHQQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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