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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd949fc02c2b1ba6f987e59b7341474f8dfc81af45bbfbf02ed3ea271d284cb8d' 
  AND token = 'ZiV2cZzb7p6V64Yx+rqhfi0eAt9UlqzrNULErH7s//A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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