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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4aed84adebb952dd28cef9a0cd534e966fca137bb6f21dc9abbf09b47726d7' 
  AND token = 'wAV8NPXDDs0Y2XwXo/THscIA+Y1NwRsYy/R+g8TsseQ=' 
  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"
    }
  }
}