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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad148d250c4cd971013b1435aad97e94f60ea944bffe5240a1465f1ecbf2bc72' 
  AND token = 'HFpaH6ggLHnk6sL/VerFh/Y+2J+yzp15uSdK9x+foOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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