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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac720e800bb39c402ecd1bd64b02b0d35bab2934923c821927957d0fe605d290' 
  AND token = 'xAnhd+xT/MIZsCmxw97AZaoo1oOhGxtJjqRWVfQ/m+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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