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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eadf21cf2ce55eb3f03fd6dd1dc377b6411c0fa034ba9d3ba2e0ad644f4f7ef' 
  AND token = '9+2VDkeCM3Do/U4lyUqdmgSb64S7A2VWmnD7WIHTTN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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