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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925090c161a52d545d0a2b1d78ba49d09961179b2ba2ff366e7b5a4b4dcb50e1' 
  AND token = '9EdJONC3ZrshsmcdiH6aZ4qDz7MHiYxkbDU2BgRg8+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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