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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ae0ee28299a1dfd6b511a7929ba457fee34d6d72e3d00855b457fc0a4d948f' 
  AND token = 'TS0AnozVZY3dAVJFJ8l7fuAySHBUO18Rs7niivoSQLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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