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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '223aea744ddfa0f7d426fd843ca38210d6cb83c37c554a2dc12c92c3797832e8' 
  AND token = 'xZVPx6kYHj9MA14gpXs43vbxonyHwdAeG/JdBvl/tZQ=' 
  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"
    }
  }
}