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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d3605a638a2ae21689a34ad24bbfc2d26ffe14e3d8c828401c8e6d95835a7d' 
  AND token = '0At4O6iVDgOyNWxlwKtcmEnQkGVTdTZKs9ie/86rM8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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