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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039c44b650dd99fdaaa729d3fdba9f692d492be58ef0d2884a8b1ed1aa0d7463' 
  AND token = 'iKt11tZfZ362e6uavoxgmGJARx3CI0AecScpTc3J5yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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