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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c1a55bfc9713d479c7b245bb91504859fbe7a6428d8f5569a5b49bf1e840c7' 
  AND token = 'xUXDDONgf67QOZSzriUDjtt4cs0e/EER3gCh8kSV7x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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