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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f076552e1bd09c891ef1722f737d78378dba5dc3608d0d64af4d26b97e1720a2' 
  AND token = 'UFei8nCqt4ZOXU+o7PfWiJJ6enLy0WUgORYeE9y93js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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