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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c391a24c0a665876353ea54ad6764b9c4326c5fce71a43af77e5b37107d9ea' 
  AND token = 'ns5VuqIhG0ioKwlFABE58Yfn5nwoMC3T5jKr8fFPQMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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