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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52891b7e25c8121517161eaf2509da67d49d7443bc8d0d655c4cf620c4fe97d8' 
  AND token = 'MwNnk95RXpLxod6hneC5L5rqlcfZBjdopgv4IoViFbU=' 
  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"
    }
  }
}