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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9921b0be23787654745966581b65b945b0200a31cd07fcc6e104afa9c8b7ecb4' 
  AND token = '3VLGZI0Ebea0qejihz4Z32XvBrdMXzfkXpsGfg7kuaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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