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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0910dd7d6bf696393197b2963641a5b890fdf57ec6aa9430a5016fe8a34254' 
  AND token = 'UFVqnAdUNS0GDZL8p1oc09/S/1fwTiE6VbbVyOabKN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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