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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ea558f18bc43b4b7e32be07aa2906520314dec1eefb14f0d4b6f42d3a152c5' 
  AND token = 'lWOZL3nP09vjMMeFzMgoUas6c760ruD3Tx6tOANQWeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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